Systems and Methods for Aperiodic Measurement Reference Signal Transmission in Multiple Antenna Systems

1. A wireless transmit/receive unit (WTRU), the WTRU comprising: a processor, wherein the processor is configured to: receive configuration information for a channel state information reference signal (CSI-RS), wherein the configuration information indicates one or more CSI-RS resources; receive scheduling information for reception of a physical downlink shared channel (PDSCH) transmission, wherein the scheduling information indicates PDSCH resources, wherein the PDSCH resources include a first number of resources and a second number of resources, and wherein the first number of resources overlaps with at least a CSI-RS resource from the one or more CSI-RS resources; and receive the PDSCH transmission, wherein: on a condition that the CSI-RS is an aperiodic non-zero power CSI-RS (NZP-CSI-RS), the processor is configured to use the first number of resources and the second number of resources, or puncture the first number of resources and use the second number of resources; and on a condition that the CSI-RS is a periodic NZP-CSI-RS, the processor is configured to use the second number of resources.

2. The WTRU of claim 1, wherein the processor being configured to receive the PDSCH transmission on the condition that the CSI-RS is the aperiodic NZP-CSI-RS comprises the processor being configured to receive the PDSCH transmission using at least a PDSCH modulation symbol, wherein the PDSCH modulation symbol maps to a PDSCH resource from the PDSCH resources.

3. The WTRU of claim 1, wherein the processor being configured to receive the PDSCH transmission on the condition that the CSI-RS is the periodic NZP-CSI-RS comprises the processor being configured to receive the PDSCH transmission using at least a PDSCH modulation symbol, wherein the PDSCH modulation symbol maps to a PDSCH resource from the second number of resources.

4. The WTRU of claim 1, wherein the processor being configured to receive the PDSCH transmission comprises the processor being configured to receive the PDSCH transmission on a condition that the CSI-RS is a periodic zero-power CSI-RS (ZP-CSI-RS), or an aperiodic ZP-CSI-RS.

5. The WTRU of claim 1, wherein the PDSCH resources comprise a resource element.

6. The WTRU of claim 1, wherein the CSI-RS resource comprises a resource element.

7. A base station, the base station comprising: a processor, wherein the processor is configured to: send configuration information for a channel state information reference signal (CSI-RS), wherein the configuration information indicates one or more CSI-RS resources; send scheduling information for reception of a physical downlink shared channel (PDSCH) transmission, wherein the scheduling information indicates PDSCH resources, wherein the PDSCH resources include a first number of resources and a second number of resources, and wherein the first number of resources overlaps with at least a CSI-RS resource from the one or more CSI-RS resources; and send the PDSCH transmission, wherein: on a condition that the CSI-RS is an aperiodic non-zero power CSI-RS (NZP-CSI-RS), the processor is configured to use the first number of resources and the second number of resources, or puncture the first number of resources and use the second number of resources; and on a condition that the CSI-RS is a periodic NZP-CSI-RS, the processor is configured to use the second number of resources.

8. The base station of claim 7, wherein the processor being configured to send the PDSCH transmission on the condition that the CSI-RS is the aperiodic NZP-CSI-RS comprises the processor being configured to send the PDSCH transmission using at least a PDSCH modulation symbol, wherein the PDSCH modulation symbol maps to a PDSCH resource from the PDSCH resources.

9. The base station of claim 7, wherein the processor being configured to send the PDSCH transmission on the condition that the CSI-RS is the periodic NZP-CSI-RS comprises the processor being configured to send the PDSCH transmission using at least a PDSCH modulation symbol, wherein the PDSCH modulation symbol maps to a PDSCH resource from the second number of resources.

10. The base station of claim 7, wherein the processor being configured to send the PDSCH transmission comprises the processor being configured to send the PDSCH transmission on a condition that the CSI-RS is a periodic zero-power CSI-RS (ZP-CSI-RS), or an aperiodic ZP-CSI-RS.

11. The base station of claim 7, wherein the PDSCH resources comprise a resource element.

12. The base station of claim 7, wherein the CSI-RS resource comprises a resource element.